sincennes



(No Model.) Q-Sheets-Sheet 2.

G. H. D. SINCENNES. ROLLING STEP LADDER.

Patented June 7, 1892 vwewtoz m5 cams PETERS ca, pnormlmo wasuxmmu, o c.

UNITED STATES PATENT FFICE.

CHARLES HID. SINOENNES, OF MONTREAL, CANADA.

ROLLING STEP-LADDER.

SPECIFICATION forming part of Letters Patent No. 476,564, dated June *7, 1892.

Application filed February 6, 1892. Serial No. 422,304:- (No model.)

To all whom it may concern:

Be it known that I, CHARLES HnRoULE DAMASE SINCENNES, of the city of Montreal, in the district of Montreal and Province of Quebec, Canada, have invented certain new and useful Improvements in Rolling Step- Ladders; and I do hereby declare that the following is a full, clear, and exact description of the same.

This invention relates to rolling step-ladders which are arranged to travel along the face of store-shelving, the improvement consisting in a construction whereby the permanent inclined outward projection of the ladder from the face of the shelving can be avoided.

The present invention is an improvement upon my former ladder, patented March 1, 1892, No. 469,751, covering a construction of rolling step-ladders which carries top and bottom rollers having traveling; connection with the bottom and top edges, respectively, of upper and lower guide-railing and confined between same, such form under some circumstances, however-such as where the shelving has little or no counter-ledge-requiring the construction of the ladder with permanent outwardly-projecting inclined and curved side boards, which permanent outward projection is an objectionable feature in that where the ladder is situated behind a counter great inconvenience is experienced.

Hy invention consists in making such step portion movable laterally or in a direction other than along the face of the movable shelving, so that it can be made to lie back out of the way or be lifted outward to avoid obstacles. For full comprehension, however, of the invention reference must be had to the annexed drawings, forming part of this specification,in which like symbols indicate corresponding parts, and wherein- Figure 1 is a front view of the rolling stepladder applied to a set of shelving without any counter-ledge; Fig. 2, a side view of the same parts broken away and showing the ladder in position to be used, the reverse or normal position of certain parts being indicated by dotted lines; Fig. 3, a similar view to Fig.

l, showing the ladder applied to shelving with counter-ledge; and Fig. 4, a similar view to Fig. 2, but of the ladder and parts shown in Fig. 3.

In carrying out my invention I use a rigid back-frame A, constructed in any desired way with vertical and horizontal bars, and carrying upper and lower grooved rollers a a Z) 1), adapted to travel along the under and upper sides, respectively, of upper and lower guiderailings a I), attached to the shelving, the same as shown in my former application.

0 is the step-ladder portion, constructed of side bars 0 O and steps 0 c separately from the frame A.

Where the ladder is to be applied to shelving, as shown in Figs. 1 and 2, the back-frame is made the full height of the ladder and carries the rollers at top and bottom, while the arrangement shown in Figs. 3 and 4 calls for the confinement of the back-frame to the face of the counter portion.

The connection of the step-ladder portion with the back-carrier frame can be secured in a variety of ways; but I prefer a pivotal or hinge connection D, as shown,the connection in the one case being at the top of the stepladder portion and in the other about midway of its length, a prop E, preferably in the form of a curved ratchet-bar, being pivoted at one end to the step portion 0 and adapted to look at any desired point upon a pin 0, carried by the back-frame, so that the angle of inclination of such step portion can be varied.

The arrangement shown in Figs. 3 and 4 in some cases calls for the use of a holdfast at the bottom, which holdfast I prefer to make in the form of a counterbalanced treadle F, pivoted to the back-frame and carrying a ratchet-tooth F on its front half, which arrangement allows the step portion to swing inward and be locked and released when such front end is depressed, the upper end of the ladder being provided with bearing-plates to rest against the shelving when in use.

lVhat I claim is as follows:

l. The combination, with store-shelving and upper and lower guide-railing, of a traveling carrier-frame confined between said upper and lower guide railing and a swinging ste p carrying portion carried by and traveling with said frame.

2. The combination, with store-shelving and upper and lower guide-railing, of a traveling carrier-frame confined between said upper and lower guide-railing, and a pivoted stepcarrying portion or frame, and means for bold ing' same at an angle of inclination.

3. In a rolling step-ladder, the combination, with store-shelving'and u pper and lower guiderailing, of a traveling carrier-frame confined between said upper and lower guide-railing, a step-carrying poltion or frame pivoted at its upperend to said carrier-frame, and a pivoted curved prop adapted to hold such step portion at an angle of inclination.

a. The combination, with store-shelving and upper and lower guide-railing, of a traveling carrier-frame confined between said upper and lower guide-railing and a movable stepcarrying or ladder portion.

5. The combination, with store-shelving and upper and lower guide-railing, of a vertical traveling carrier-frame carrying vertical rollers confined between said guide-railing and an inclined step-carrying or ladder portion.

6. In a rolling step-ladder, the combination, with store-shelvingand upper and lower guiderailing, of a traveling carrienframe confined between said upper and lower guide-railing, a pivoted stepcarrying portion, and a curved ratchet-prop E and pin adapted to hold such step portion at an angle of inclination.

7. The combination, with store-shelving and upper and lower guide-railing, of a traveling carrier-frame confined between said guiderailing, and a pivoted step carrying portion pivoted about midway of its length to said carrier-frame, and hold fast devices for retaining the ladder in its normal position or at an angle for use.

Montreal, February 1, 1892.

CHARLES H. D. SINGENNES.

In presence of- FRED. J. SEARS, WILL. P. MOFEAT. 

